Abstract
Abstract. (1) Sterile filtration of whole blood or blood cell suspensions in saline through columns of tightly packed cotton wool results in removal of over 95% of the leukocytes. (2) From whole blood, thrombocytes are inefficiently removed by the filtration procedure; filtration of blood cell suspensions in saline results in a better removal. (3) A system is designed by which filtration of 500 ml portions can be performed in less than 1 h at room temperature. (4) Red cell recovery with this system is over 90%. (5) Neither pyrogen tests nor toxicity tests did reveal the elution of harmful substances from properly prepared columns.
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